Spectral DMC-30SV Series 2 'Super Veloce' Reference Preamplifier

Design Overview
After years of painstaking research and development coupled with exhaustive listening trials the Spectral DMC-30SV “Super Veloce” Reference Preamplifier was introduced utilizing Spectral’s new benchmark SV technology. As the premiere example of Spectral’s custom SV semiconductor technology, the DMC-30SV has been an unqualified success, joined in recent years by the similarly advanced SV reference standard amplifiers. Taken together, the Spectral SV component series has taken Spectral music systems to a new level of realism and accuracy which redefine the state of the art. Now the evergreen DMC-30 preamplifier is once again reimagined with the most advanced refinements from our cutting edge research. The new DMC-30SV Series 2 continues the relentless refinement of our classic DMC-30 series and represents the most advanced reference preamplifier we have offered in our long history. Since the establishment of our company in the 1970s and the introduction of our very first audio component, high performance preamplifier design has occupied the highest engineering priority at Spectral. Our special focus on high end preamplifier development over the years is based on the major design challenges which low level amplifier and control circuitry represent. At these critical signal levels, minute amplifier distortions and signal control colorations are passed on and magnified by power amplifiers to dominate the sonic signature of the best audio systems. Spectral engineers have spent the last four decades pursuing ideal performance and signal transparency in audio preamplifiers to realize ultimate fidelity in high end music systems. Relentless Refinement: The DMC-30SV Series 2 The DMC-30SV reference preamplifier was widely considered to be the most accurate and transparent preamp in the industry. But recent advances in high performance topologies and custom components have moved the art forward at Spectral. We knew as we developed the new circuits and components for the DMA-500 anniversary amplifier that the advances in our SV technology would have application back in the DMC-30SV preamplifier. These ultra low impedance circuits are defined by our custom built semiconductors and high precision passive components. In the DMA-500 drivers, our SV FET technology is supported by the most advanced family of passive components ever made for a Spectral amplifier. With the proven reliability and superior transparency that has been achieved in the DMA-500, our engineers applied the new techniques and components to the DMC-30SV S2 to transfer these benefits and further advance circuit speed while simultaneously lowering complex distortions. The Remarkable ‘Teflon Array’ Technology The DMC-30SV was one of Spectral’s most successfully realized components as the first of our Super Veloce generation, but our ideal SV preamp topology can be further perfected with the extreme precision values, elements and dielectric films created for the DMA-500. Key to the performance of the DMA-500 is the remarkable Teflon Array technology created for the SV driver which lowers capacitance and inductance to improve stability at very high frequencies. Our new balanced 301C output module for the DMC-30SV S2 utilizes Spectral’s ‘Teflon Array’ film capacitor technology to replace all previous film capacitors in the signal path. New construction bulk metal lithographic resistors join the TA capacitors to eliminate the previous trimming elements. Improvements in compensation, stability, feedback and gain setting are the result and optimize the revised SHHA output modules on a higher plane. To support the revised line level output section of the DMC-30SV S2, a new power supply transformer with improved regulation and headroom are also employed. The result is improved dynamics and low-level clarity. The SHHA Generation 3 Analog Line Section The foundational core of the DMC-30SV S2 preamplifier rests on the Spectral High-speed Hybrid Amplifier SHHA Gen 3 line modules. Our highly evolved, high performance SHHA modules are now ideally powered and precisely compensated in the new 301C balanced output section of the DMC-30SV Series 2. Just as the preamplifier is the essential heart of the finest music systems, the SHHA high-speed module is the essential heart of our high resolution preamplifiers. For this reason, the modular architecture of Spectral preamps has been developed to accommodate design evolution of our SHHA technology with convenience and ease. Now the 301C SHHA G3 line section of the DMC-30 S2 incorporates the ‘Teflon Array’ technology as well as other advances which optimize all operating parameters of the DMC-30 S2 line output section. These and other advances in the SHHA G3 module assure uncompromising sonics and extended reliability. Musical results include higher resolution, greater dynamics and improved harmonic structure. Vastly improved imaging and focus result from the elimination of transistor thermal tail distortions and dielectric film nonlinearities. Seeking The Missing Link With the widespread use of integrated circuit op amp topologies in current high-end digital processors and digital source components, the role of the preamplifier to optimize the component interface has never been more critical to final system performance. Today's digital converters have a challenging task delivering precision conversions of music files and downloads while also driving complex cables and low impedance input loads utilizing rudimentary analog circuits and basic power supplies. Without the benefits of discrete, high bias analog amplifiers, digital processors struggle to provide optimal drive and load isolation when faced with the full dynamics of high resolution recordings. In addition to these output drive limitations, IC-based digital processors require balanced output operation to avoid higher distortion levels which occur when used single ended. It is also important to recognize that digital audio processors are not equipped to perform the role of preamplifier in high end audio component systems. Power amplifiers require robust drive capabilities from the best discrete class A preamplifier line sections to avoid impedance mismatching, current limiting and cable reflection problems associated with low bias IC op amp output sections. The Model 304 Balanced Input Amplifier To address the shortcomings inherent in the output sections of today's high end digital processors, Spectral engineers developed the model 304 balanced input amplifier. The model 304 is a discrete, high-speed class A unity gain buffer operating on unusually high voltage rails. This fully push pull topology is derived from our innovative SDR-4000 I/V balanced amplifier and features superior performance to any IC buffer. The model 304 is design optimized as a discrete buffer amplifier unlike conventional IC input buffers. Custom discrete buffers are a rarity in audio today but still are found in the best ultra premium recording consoles. Although difficult to design and hugely expensive compared to op amps, the optimized discrete input buffer is the only uncompromised solution for interfacing digital audio components and amplifiers. Spectral engineers take the discrete input buffer to the next level in the 304 balanced input amplifier. Custom matched JFET transistors are employed in the cascode front end. Built to Spectral specifications for low gain applications, the handbuilt devices lower crossover distortion, noise and improve common mode rejection. Bandwidth, slew rate and distortion are all vastly superior to conventional buffers. The speed and resolution of the 304 balanced input buffer are exemplary and perfectly compliment the superlative performance of the 301C line section of the DMC-30SV S2. Instantaneous Accuracy: The Final Frontier In the DMC-30SV S2 reference preamplifier, Spectral brings together some of the most accurate and sophisticated circuits yet developed for music reproduction. Through painstaking research and development, new line level output stages employ next generation instrumentation technology, which address historic distortion problems in solid-state semiconductor design, with heroic results. Amplifier topologies in the DMC-30SV S2 are the fastest and deepest settling that we have developed. Premium passive component technologies used in critical locations are of unsurpassed quality. Today, no other preamplifiers have the ultra-fast signal response and the instantaneous signal extinction achieved in the DMC-30SV S2. This "instantaneous accuracy” sets the stage for remarkably transparent, articulate and vividly immersive sonics. The DMC-30SV S2 Reference Preamplifier: At the Leading Edge We are pleased to see that more and more music enthusiasts are coming to understand that no music system can be any better than the performance of its preamplifier. There is growing sophistication in regards to absolute performance and price. At a time when ultra high price preamplifiers are routinely introduced at several times the cost of Spectral, the thoughtful music enthusiast is left to wonder exactly what benefits these lofty prices buy? We believe the sophisticated customer will find the answer in the uncompromising DMC-30SV S2. Few preamplifiers at any price can boast the designer credentials and unrivaled component quality of the DMC-30SV S2. Edge of the art amplifier technology and advanced custom component design are utilized throughout the DMC-30SV S2 to a degree rarely seen in stratospheric components. This is because Spectral engineers have identified those key components that most determine instrument stability and sonic transparency and have invested agressively. When careful investment in superior circuit performance and signal path components becomes the design priority over elaborate metalwork sculpture, state of the art clarity and signal resolution can be achieved with excellent value. The DMC-30SV Series 2 builds on the excellent fundamentals of the DMC-30SV reference preamplifier to achieve altogether superior transparency and resolution. Utilizing the new 301C line section output module featuring our exclusive “Teflon Array” technology and other topology refinements, the new DMC-30SV S2 performs with immersive sonics and dazzling realism. Now our goal of achieving 2C3D and true spatial coherence has been fully realised. Compare our new DMC-30SV Series 2 reference preamplifier against the most costly and ambitious high end preamps in the industry. We are confident you will discover the important musical difference superior engineering experience and design innovation make.
1) What is it? The DMC-30SV Series 2 is the new reference preamplifier from Spectral. Like all prior DMC-30 preamplifiers, it features very high performance and value. It offers the finest performance yet achieved in an audio preamp. 2) Why was it created? Although many high end audio enthusiasts are even now just discovering the uncompromising sonic performance of the DMC-30SV reference preamplifier, Spectral dealers have been demonstrating the DMC-30SV in their state-of-the-art systems for over five years. During this time the DMC-30SV has been extremely successful and has been widely considered the most accurate and transparent preamplifier available at any price. More recently new advances in high performance amplifier topologies and custom components have moved the art forward at Spectral. By incorporating our newest technology and refinements, we are able to offer the most advanced Spectral preamplifier yet. 3) What are the objectives for the DMC-30SV Series 2? We knew as we developed the new circuits and components for the DMA-500 Anniversary Reference mono amplifier that the advances in our SV technology would have application back in the DMC-30SV preamp. These ultra-low impedance circuits are defined by our custom built semiconductors and high precision passive components. In the DMA-500 drivers, our SV FET technology is supported by the most advanced family of custom passive components ever made for a Spectral amplifier. WIth the proven reliability and superior transparency that had been achieved in the DMA-500, Spectral engineers applied the new techniques and components to the DMC-30SV S2 to further advance circuit performance and lower complex distortions. 4) What are the breakthroughs in the DMC-30SV Series 2 preamplifier? As the first component of our Super Veloce generation, the DMC-30SV has been one of Spectral's most successfully realized components. As such, we are determined not to fix something that never was broken. But our ideal SV preamp topology can be further optimized with extreme precision values, elements and films created for the DMA-500. A new high-level line section design optimizes the DMC-30SV S2 and incorporates the new generation components from the DMA-500 drivers to further lower capacitance and increase speed. The new 301C utilizes Spectral's "Teflon Array" film capacitor technology to replace all previous film capacitors in the signal path. New construction bulk film metal lithographic resistors join the TA film capacitors and eliminate previous trimming elements. Improvements in compensation, stability, feedback and gain setting are the results and optimize the revised SHHA G3 modules on a higher plane. Supporting the higher performance of line section is a revised power supply transformer with improved regulation and headroom. 5) Does the DMC-30SV S2 share components with the DMC-30SV? The new DMC-30SV Series 2 is fundamentally based on the original DMC-30SV and shares most of its topology and layout. The DMC-30SV Series 2, however, has its own line section and power supply which establish its unique performance and virtues.
Selected Design Highlights
  • Full feature remote control operates all functions.
  • Indicator displays are clearly visible from a distance.
  • New generation high-level line output section topology.
  • Improved SHHA G3 ultra high-speed hybrid amplifier modules with ultra precision compensation components.
  • 80 volts peak-to-peak output voltage for unprecedented dynamics.
  • Relays allow signal control selection at the optimal point in the circuitry, maintaining the shortest signal path.
  • Microprocessor "sleep mode" and silent display architecture.
  • Cost-no-object discrete custom component technologies.
  • Custom ultra-precision mil-spec motorized studio audio volume attenuator.
  • Ultra low-noise "silent power" supply system, with floating ground shunt regulation.
  • Three-tiered architecture takes the signal path off the power supply circuit board.
  • Balanced architecture takes maximum advantage of differential operation.
  • Optically isolated protection systems for maximum signal purity.
  • Custom semiconductor devices developed exclusively for this topology.
  • Custom Teflon and polystyrene film capacitors in critical circuit locations.
  • Proprietary ultra-precision Teflon Array film capacitor technology.
  • Bulk metal ultra precision resistors in critical signal locations.

SPECIFICATIONS

DMC-30SV Series 2 Reference Preamplifier Front Panel Controls• Output Level• Balance left/right• Input selectors• Monitor switch• Stereo/Mono switch• Absolute Phase switch• Mute Switch• Surround LED indicator• Protection LED indicator Front Panel Display• Output Level display - 50 step LED• Output Balance display - 50 step LED Rear Panel• 5 RCA Input connector sets (gold)• Balanced Input Neutrik XLR connectors (gold)• Tape input and output RCA connector set (gold)• Main Output RCA connectors (gold)• Balanced Output Neutrik XLR (gold)• AC Power input connector, switch and line fuse DMC-30R Remote Control Control Buttons• Output Level• Channel Balance• Mute• Input selectors• Stereo/mono• Phase Invert• Tape Monitor• Display Brightness• Control Rate• Control Reset
DMC-30SV Series 2 Preamplifier Technical Data Input Compliment 7 inputs - 5 normal (RCA), 1 balanced (XLR), tape monitor (RCA) Output Compliment 3 outputs - normal (RCA), balanced (XLR), tape (RCA) Control Compliment: Output Attenuation Motorized custom fader conductive plastic, modified log taper Output Balance Relay attenuator system with center position bypass Mute Switch 0, -20 dB attenuation High Level Trim 0 and -12dB attenuation for all high level inputs Mode Switches Stereo/Mono Absolute Phase Input Select 6 position, and Tape Monitor Output Level Display 50 step LED Output Balance Display 50 step LED Input Impedance 15K ohms Output Impedance 100 ohms Gain 20 db unbalanced, 26 db balanced Recording Amplifiers: Input Impedance 11K ohms, 100 ohms minimum load Output Impedance 2K ohms Protection Circuit: Protection Mode DC offset, oscillation Method: Crowbar output relays Sensitivity 20 mV continuous DC Recovery Approximately 10 seconds Chassis Temperature Internal 48 degree Celsius @ 25 degree C room temperature Frequency Response: DC to 5 MHz -3dB DC to 1 MHz -0.10dB Any level to 36 V RMS Slew Rate 1000 V/us or greater Rise Time 70 ns Distortion - Static Less than .005% THD and IM Crosstalk Greater than 97dB Noise 108dB A Weighted, ref 100 mV @ 1 KHz Output Voltage 1.6 VRMS, 100 V peak to peak maximum Output Current 1 Ampere maximum per channel, balanced out Gain Options 15 dB, 21 dB
Remote Control Operates all front panel functions, level and balance rates, display brightness and system reset DMC-30SV Series 2 Mechanical Specifications Dimensions: 19" W 12.25" D 4.1" H 48.3 cm W 31.1 cm D 10.4 cm H Weight: 26 lbs net. 11.8 kg net. Please note that all of the information and specifications provided herein are subject to change owing to the evolutionary nature of Spectral designs and technology.
SPECTRAL MIT ultralinear INTERCONNECT CABLES